Shuttles for narrow fabric looms



June 2, 1959 L. RITSKY SHUTTLES FOR NARROW FABRIC LOOMS Filed April 25, 1957 Mm flaw BY i a ATTORNEY United States Patent 6 SHUTILES FOR NARROW FABRIC LOOMS Louis L. Ritsky, Philadelphia, Pa.

Application April 23, 1957, Serial No. 654,488

3 Claims. (Cl. 139-201) This invention relates to shuttles for narrow fabric looms, and it relates more particularly to the devices used in such shuttles for taking up the slack in the filling during the operation of the loom, thereby to maintain the proper tension on the filling yarn as it is laid in the shed.

Heretofore, in shuttles for narrow fabric looms, it has been customary to employ coil springs for taking up the slack in the filling between the bobbin and the outlet eye of the shuttle.

Such coil springs were used for the purpose of maintaining the feed of the filling at a substantially uniform tension, by means of the expansion and retraction of said coil springs which are employed in a sufiicient number in the shuttle to accomplish the desired purpose. Each of said coil springs was secured at one end in the shuttle and was provided at its free end with an eye member through which the filling yarn passed.

However, the successive convolutions of the coil springs heretofore employed as aforesaid were uniform in diameter throughout the length of the spring.

The principal object of the present invention is to provide in loom shuttles, and particularly in shuttles for narrow fabric looms, coil springs for taking up the slack in the filling as the same is fed from the bobbin to the outlet eye of the shuttle, which springs will function more efficiently, and the tension of the yarn will be more uniform with resultant improvement in the quality of fabric woven.

The nature and characteristic features of the present invention will be more readily understood from the following description, taken in connection with the accompanying drawing forming part hereof, in which:

Figure 1 is an elevational view of a tension spring embodying the main features of the present invention, the same being shown greatly enlarged and being adapted to be placed in the loom shuttle in the usual manner;

Fig. 2 is an elevational view, partly in section, illustrating a conventional narrow fabric loom shuttle, having mounted therein novel tension springs comprising the principal feature of the present invention.

It should, of course, be understood that the description and drawing herein are illustrative merely, and that vari ous modifications and changes may be made in the structure disclosed without departing from the spirit of the invention.

Referring to the drawing, the shuttle may be of the usual form commonly used in narrow fabric looms and consisting of a body ltd, preferably made of wood or the like.

The shuttle is hollowed out in the center and, in the opening thus provided, there is mounted the usual spinrile 11 for the bobbin 12 of the filling yarn.

The shuttle is also provided with the usual friction member 13, one end of which bears against the bobbin 12, under the tension of the spring 14.

The shuttle is also provided, preferably in its central axis, with an outlet eye in which a sleeve 16, of hard material, such as porcelain or glass, is mounted for the passage therethrough of the filling yarn F as the same is laid into the shed during the weaving operation.

Adjacent the outlet eye there is provided a wire loop 17 for the mounting of a guide ring 18, made of hard material, such as porcelain or glass.

In each of the side shank portions of the shuttle body there is provided a hole 19 in which the tension springs 20 are mounted. The peculiar formation of the tension springs 20 is of the essence of the present invention.

Heretofore, such tension springs were made of fine piano wire, the convolutions of which were of uniform diameter from end to end of the spring.

The present invention contemplates a novel form of tension springs 20, the convolutions of which are made progressively larger from the anchored end 21 of the spring 20 to the free end 22 thereof.

The free end 22 of the spring 20 is provided with an eye member 23, preferably made of a form similar to an eye bolt, with the shank portion thereof extending into the convolutions of the free end of the spring.

The filling yarn F runs off from the bobbin 12 to the guide ring 18, thence to the eye member 23 provided at the free end of one of the coil springs 20, thence crosswise to the eye member 23 at the free end of the other coil spring 20, thence through the outlet sleeve 16 to be laid into the shed as the shuttle is reciprocated back and forth in the usual manner.

It has been found in practice that the action is considerably facilitated if one of the coil springs, that is the one to the eye of which the filling first passes, after it leaves the bobbin, be made slightly heavier than the other coil spring. In actual practice, said spring was made of wire of .006 inch, whereas, the spring to the eye of which the filling passes just before it emerges from the shuttle was made of wire of .005 inch.

It has been found by tests that springs. made of the peculiar conformation as herein set forth will function in a much more satisfactory manner than the springs heretofore employed, in which the convolutions were of uniform diameter from end to end.

In the operation of the shuttle, the free ends of the springs 20 will extend in varying amounts thereby to take up the slack in the filling yarn F as the shuttle is reciprocated in successive sheds, and by reason of the novel formation of the tension springs, as herein set forth, the action, in taking up the slack and imparting the desired tension to the filling yarn, will be accomplished much more effectively than has heretofore been possible.

I claim:

1. In a shuttle for narrow fabric looms having at least one coil spring for imparting tension to the filling yarn, said coil spring having one end anchored in the body of the shuttle, and the other end extensible and contractable to take up slack in the filling yarn, said coil spring being made of fine wire with the convolutions thereof progressively increasing in diameter from the anchored end to the free end thereof.

2. In a shuttle for narrow fabric looms having at least one pair of coil springs for imparting tension to the filling yarn, said coil springs each having one end anchored gasses? in the body of the shuttle, and the other end extensible and contractable to take up slack in the filling yarn, said coil springs each being made of fine wire with the convolutions thereof progressively increasing in diameter from the anchored end to the free end thereof.

3. In a shuttle for narrow fabric looms having at least one pair of coil springs for imparting tension to the filling yarn, said coil springs each having one end anchored in the body of the shuttle and the other end extensible and contractable to take up slack in the filling yarn, said coil springs each being made of fine wire with the convolutions thereof progressively increasing in diameter from the anchored end to the free end thereof, and one of said coil springs being made of wire slightly heavier than that of which the other coil spring is made.

References Cited in the file of this patent UNITED STATES PATENTS 528,721 Hendryx Nov. 6, 1894 768,408 Sterrett Aug. 23, 1904 1,001,910 Wackerhagen Aug. 29, 1911 1,794,911 Livermore Mar. 3, 1931 2,781,795 Turner Feb. 19, 1957 

